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United States Diversified Retail

Costco Wholesale Corp (COST)

Track

Over the last 90 days, Costco Wholesale Corp. has seen net insider selling totaling $695,100. All reported transactions were sales, with no insider purchases. This activity involved 5 transactions, with executives accounting for the entire net sell value. The stock price has experienced a slight decline of 2.1% in the past 90 days.
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Ticker: COST Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Top insiders
Trades
DENMAN KENNETH D
2 sales — total 200,000 USD
Sale 23 Jun 2026
Value US$805,659.77 | Price 129.59 | Shares 96,829
Proposed sale 23 Jun 2026
Value US$410,177.57 | Price 150.62 | Shares 71,678
Proposed sale 12 Jun 2026
Value US$4,280,506.56 | Price 268.86 | Shares 97,491
Proposed sale 5 Jun 2026
Value US$100,000.00 | Price 995.37 | Shares 1,000
Sale 1 Apr 2026
Value US$695,100.00 | Price 993.00 | Shares 700
Proposed sale 1 Apr 2026
Value US$689,758.00 | Price 985.37 | Shares 700
Sale 9 Mar 2026
Value US$732,205.33 | Price 1,003.02 | Shares 730
Proposed sale 9 Mar 2026
Value US$732,205.33 | Price 1,003.02 | Shares 730
Sale 21 Jan 2026
Value US$838,318.20 | Price 986.26 | Shares 850
Proposed sale 21 Jan 2026
Value US$838,318.27 | Price 986.26 | Shares 850
Sale 16 Jan 2026
Value US$437,390.00 | Price 955.00 | Shares 458
Proposed sale 16 Jan 2026
Value US$437,390.00 | Price 955.00 | Shares 458
Sale 14 Jan 2026
Value US$1,408,500.00 | Price 939.00 | Shares 1,500
Proposed sale 14 Jan 2026
Value US$1,408,500.00 | Price 939.00 | Shares 1,500
Sale 9 Jan 2026
Value US$1,374,480.00 | Price 916.32 | Shares 1,500
Proposed sale 9 Jan 2026
Value US$1,374,480.00 | Price 916.32 | Shares 1,500
Sale 30 Dec 2025
Value US$481,758.59 | Price 862.90 | Shares 558
Proposed sale 30 Dec 2025
Value US$481,758.59 | Price 861.82 | Shares 559
Sale 29 Dec 2025
Value US$1,776,903.86 | Price 867.21 | Shares 2,049
Proposed sale 29 Dec 2025
Value US$1,776,903.90 | Price 867.21 | Shares 2,049
Sale 7 Nov 2025
Value US$2,232,312.00 | Price 930.13 | Shares 2,400
Proposed sale 7 Nov 2025
Value US$2,232,312.72 | Price 930.13 | Shares 2,400
Proposed sale 24 Oct 2025
Value US$1,158,352.69 | Price 934.16 | Shares 1,240
Sale 24 Oct 2025
Value US$1,158,352.64 | Price 934.62 | Shares 1,239
Proposed sale 24 Oct 2025
Value US$2,526,336.27 | Price 935.68 | Shares 2,700
Sale 24 Oct 2025
Value US$2,526,336.00 | Price 935.68 | Shares 2,700
Sale 29 Sep 2025
Value US$3,093,615.00 | Price 915.00 | Shares 3,381
Sale 29 Sep 2025
Value US$1,401,430.80 | Price 910.02 | Shares 1,540
Proposed sale 29 Sep 2025
Value US$1,401,430.80 | Price 910.02 | Shares 1,540
Proposed sale 29 Sep 2025
Value US$3,093,615.00 | Price 915.00 | Shares 3,381
Sale 20 Aug 2025
Value US$595,230.00 | Price 992.05 | Shares 600
Proposed sale 20 Aug 2025
Value US$595,230.06 | Price 992.05 | Shares 600
Sale 14 Jul 2025
Value US$3,899,852.00 | Price 974.96 | Shares 4,000
Proposed sale 14 Jul 2025
Value US$3,899,850.00 | Price 974.96 | Shares 4,000
Sale 18 Jun 2025
Value US$978.40 | Price 978.40 | Shares 1
Sale 18 Jun 2025
Value US$535,080.00 | Price 980.00 | Shares 546
Proposed sale 18 Jun 2025
Value US$978.40 | Price 978.40 | Shares 1
Proposed sale 18 Jun 2025
Value US$535,080.00 | Price 980.00 | Shares 546
Sale 9 Jun 2025
Value US$3,008,298.00 | Price 1,002.77 | Shares 3,000
Proposed sale 9 Jun 2025
Value US$3,008,296.50 | Price 1,002.77 | Shares 3,000
Sale 6 Jun 2025
Value US$2,028,294.00 | Price 1,014.15 | Shares 2,000
Proposed sale 6 Jun 2025
Value US$2,028,294.00 | Price 1,014.15 | Shares 2,000
Sale 17 Apr 2025
Value US$3,924,280.00 | Price 981.07 | Shares 4,000
Proposed sale 17 Apr 2025
Value US$3,924,280.40 | Price 981.07 | Shares 4,000
Proposed sale 27 Mar 2025
Value US$1,034,007.04 | Price 940.01 | Shares 1,100
Sale 27 Mar 2025
Value US$1,034,006.60 | Price 940.01 | Shares 1,100
Sale 24 Mar 2025
Value US$830,304.00 | Price 922.56 | Shares 900
Proposed sale 24 Mar 2025
Value US$830,304.00 | Price 922.56 | Shares 900
Sale 18 Mar 2025
Value US$765,212.58 | Price 900.25 | Shares 850
Proposed sale 18 Mar 2025
Value US$765,212.58 | Price 900.25 | Shares 850
Sale 11 Mar 2025
Value US$3,351,600.00 | Price 931.00 | Shares 3,600
Proposed sale 11 Mar 2025
Value US$3,351,600.00 | Price 931.00 | Shares 3,600
Proposed sale 24 Oct 2024
Value US$1,267,279.64 | Price 894.34 | Shares 1,417
Sale 24 Oct 2024
Value US$1,267,279.61 | Price 894.68 | Shares 1,416
Sale 23 Oct 2024
Value US$717,236.00 | Price 896.55 | Shares 800
Proposed sale 23 Oct 2024
Value US$717,236.00 | Price 896.55 | Shares 800
Proposed sale 15 Oct 2024
Value US$1,793,425.99 | Price 896.71 | Shares 2,000
Sale 15 Oct 2024
Value US$1,793,426.00 | Price 896.71 | Shares 2,000
Sale 11 Oct 2024
Value US$3,921,068.80 | Price 891.15 | Shares 4,400
Proposed sale 11 Oct 2024
Value US$3,921,068.80 | Price 891.15 | Shares 4,400
Sale 30 Sep 2024
Value US$2,844,777.60 | Price 888.99 | Shares 3,200
Sale 30 Sep 2024
Value US$1,501,695.00 | Price 883.35 | Shares 1,700
Sale 30 Sep 2024
Value US$2,234,850.00 | Price 893.94 | Shares 2,500
Proposed sale 15 Aug 2024
Value US$543,430.00 | Price 876.50 | Shares 620
Sale 15 Aug 2024
Value US$543,430.00 | Price 876.50 | Shares 620
Proposed sale 15 Aug 2024
Value US$437,025.00 | Price 874.05 | Shares 500
Sale 15 Aug 2024
Value US$437,025.00 | Price 874.05 | Shares 500
Sale 13 Aug 2024
Value US$431,937.50 | Price 863.88 | Shares 500
Proposed sale 13 Aug 2024
Value US$431,937.50 | Price 863.88 | Shares 500
Sale 25 Jul 2024
Value US$3,330.19 | Price 832.55 | Shares 4
Proposed sale 15 Jul 2024
Value US$298,035.50 | Price 851.53 | Shares 350
Sale 15 Jul 2024
Value US$298,035.50 | Price 851.53 | Shares 350
Proposed sale 15 Jul 2024
Value US$1,272,796.05 | Price 848.53 | Shares 1,500
Sale 15 Jul 2024
Value US$1,272,796.05 | Price 848.53 | Shares 1,500
Sale 12 Jul 2024
Value US$1,266,300.00 | Price 844.20 | Shares 1,500
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-06-25 2026-06-23 S Sale
2.9
DENMAN KENNETH D
Non-Executive Director
96,829 +14.4%
129.59
US$805,660 		96,829 +14.4% 129.59 US$805,660
2026-06-23 2026-06-23 PrS Proposed sale
2.9
DENMAN KENNETH D

Director

Non-Executive Director
71,678
150.62
US$410,178 		71,678 150.62 US$410,178
2026-06-12 2026-06-12 PrS Proposed sale
2.8
Callans Patrick J

Former Officer

Officer
97,491
268.86
US$4,280,507 		97,491 268.86 US$4,280,507
2026-06-05 2026-06-05 PrS Proposed sale
2.8
Callans Patrick J

Former Officer

Officer
1,000
995.37
US$100,000 		1,000 995.37 US$100,000
2026-04-01 2026-04-01 S Sale
2.3
Frates Caton

Executive Vice President

Officer
700 -10.7%
993.00
US$695,100 		700 -10.7% 993.00 US$695,100
2026-04-01 2026-04-01 PrS Proposed sale
2.3
Caton Frates

Officer

Officer
700
985.37
US$689,758 		700 985.37 US$689,758
2026-03-11 2026-03-09 S Sale
2.6
Adamo Claudine

Executive Vice President

Officer
730 -10.7%
1,003.02
US$732,205 		730 -10.7% 1,003.02 US$732,205
2026-03-09 2026-03-09 PrS Proposed sale
2.6
Adamo Claudine

Officer

Officer
730
1,003.02
US$732,205 		730 1,003.02 US$732,205
2026-01-23 2026-01-21 S Sale
2.5
Jones Teresa A.

Executive Vice President

Officer
850 -16.7%
986.26
US$838,318 		850 -16.7% 986.26 US$838,318
2026-01-21 2026-01-21 PrS Proposed sale
2.5
Jones Teresa A.

Officer

Officer
850
986.26
US$838,318 		850 986.26 US$838,318
2026-01-20 2026-01-16 S Sale
2.6
DECKER SUSAN L
Non-Executive Director
458 -5.1%
955.00
US$437,390 		458 -5.1% 955.00 US$437,390
2026-01-16 2026-01-16 PrS Proposed sale
2.6
SUSAN L DECKER TRUST

Director

Non-Executive Director
458
955.00
US$437,390 		458 955.00 US$437,390
2026-01-15 2026-01-14 S Sale
2.5
Klauer James C

Executive Vice President

Officer
1,500 -3.2%
939.00
US$1,408,500 		1,500 -3.2% 939.00 US$1,408,500
2026-01-14 2026-01-14 PrS Proposed sale
2.5
Klauer James C

Officer

Officer
1,500
939.00
US$1,408,500 		1,500 939.00 US$1,408,500
2026-01-12 2026-01-09 S Sale
2.6
Miller Russell D

Sr. Executive Vice President

Officer
1,500 -15.4%
916.32
US$1,374,480 		1,500 -15.4% 916.32 US$1,374,480
2026-01-09 2026-01-09 PrS Proposed sale
2.6
THE MILLER FAMILY TRUST

Officer

Officer
1,500
916.32
US$1,374,480 		1,500 916.32 US$1,374,480
2025-12-31 2025-12-30 S Sale
1.7
POLIT JAVIER

Executive Vice President

Officer
558 -5.2%
862.90
US$481,759 		558 -5.2% 862.90 US$481,759
2025-12-30 2025-12-30 PrS Proposed sale
1.7
POLIT JAVIER

Officer

Officer
559
861.82
US$481,759 		559 861.82 US$481,759
2025-12-31 2025-12-29 S Sale
1.7
POLIT JAVIER

Executive Vice President

Officer
2,049 -16.0%
867.21
US$1,776,904 		2,049 -16.0% 867.21 US$1,776,904
2025-12-29 2025-12-29 PrS Proposed sale
1.7
POLIT JAVIER

Officer

Officer
2,049
867.21
US$1,776,904 		2,049 867.21 US$1,776,904
2025-11-12 2025-11-07 S Sale
1.6
Wilcox William Richard

Executive Vice President

Officer
2,400 -54.5%
930.13
US$2,232,312 		2,400 -54.5% 930.13 US$2,232,312
2025-11-07 2025-11-07 PrS Proposed sale
1.6
Wilcox William Richard

Officer

Officer
2,400
930.13
US$2,232,313 		2,400 930.13 US$2,232,313
2025-10-24 2025-10-24 PrS Proposed sale
1.6
Barbre Tiffany Marie

Officer

Officer
1,240
934.16
US$1,158,353 		1,240 934.16 US$1,158,353
2025-10-24 2025-10-24 PrS Proposed sale
2.6
Adamo Claudine

Officer

Officer
2,700
935.68
US$2,526,336 		2,700 935.68 US$2,526,336
2025-10-24 2025-10-24 S Sale
1.6
Barbre Tiffany Marie

Principal Accounting Officer
1,239 -19.4%
934.62
US$1,158,353 		1,239 -19.4% 934.62 US$1,158,353
2025-10-24 2025-10-24 S Sale
2.6
Adamo Claudine

Executive Vice President

Officer
2,700 -28.3%
935.68
US$2,526,336 		2,700 -28.3% 935.68 US$2,526,336
2025-10-01 2025-09-29 S Sale
2.6
Miller Russell D

Sr. Executive Vice President

Officer
3,381 -25.8%
915.00
US$3,093,615 		3,381 -25.8% 915.00 US$3,093,615
2025-09-30 2025-09-29 S Sale
2.3
Frates Caton

Executive Vice President

Officer
1,540 -14.2%
910.02
US$1,401,431 		1,540 -14.2% 910.02 US$1,401,431
2025-09-29 2025-09-29 PrS Proposed sale
2.3
Frates Caton

Officer

Officer
1,540
910.02
US$1,401,431 		1,540 910.02 US$1,401,431
2025-09-29 2025-09-29 PrS Proposed sale
2.6
THE MILLER FAMILY TRUST

Affiliate
3,381
915.00
US$3,093,615 		3,381 915.00 US$3,093,615
2025-08-22 2025-08-20 S Sale
2.5
Jones Teresa A.

Executive Vice President

Officer
600 -20.3%
992.05
US$595,230 		600 -20.3% 992.05 US$595,230
2025-08-20 2025-08-20 PrS Proposed sale
2.5
Jones Teresa A.

Officer

Officer
600
992.05
US$595,230 		600 992.05 US$595,230
2025-07-15 2025-07-14 S Sale
2.7
Rubanenko Yoram

Executive Vice President

Officer
4,000 -40.9%
974.96
US$3,899,852 		4,000 -40.9% 974.96 US$3,899,852
2025-07-14 2025-07-14 PrS Proposed sale
2.7
Rubanenko Yoram

Officer

Officer
4,000
974.96
US$3,899,850 		4,000 974.96 US$3,899,850
2025-06-20 2025-06-18 S Sale
2.6
DECKER SUSAN L
Non-Executive Director
1 -0.0%
978.40
US$978 		1 -0.0% 978.40 US$978
2025-06-20 2025-06-18 S Sale
2.6
DECKER SUSAN L
Non-Executive Director
546 -4.5%
980.00
US$535,080 		546 -4.5% 980.00 US$535,080
2025-06-18 2025-06-18 PrS Proposed sale
2.6
SUSAN L DECKER

Director

Non-Executive Director
1
978.40
US$978 		1 978.40 US$978
2025-06-18 2025-06-18 PrS Proposed sale
2.6
SUSAN L DECKER

Director

Non-Executive Director
546
980.00
US$535,080 		546 980.00 US$535,080
2025-06-10 2025-06-09 S Sale
2.8
Callans Patrick J

Executive Vice President

Officer
3,000 -4.9%
1,002.77
US$3,008,298 		3,000 -4.9% 1,002.77 US$3,008,298
2025-06-09 2025-06-09 PrS Proposed sale
2.8
Callans Patrick J

Officer

Officer
3,000
1,002.77
US$3,008,296 		3,000 1,002.77 US$3,008,296
2025-06-09 2025-06-06 S Sale
2.1
Riel Pierre

Executive Vice President

Officer
2,000 -19.6%
1,014.15
US$2,028,294 		2,000 -19.6% 1,014.15 US$2,028,294
2025-06-06 2025-06-06 PrS Proposed sale
2.1
Riel Pierre

Officer

Officer
2,000
1,014.15
US$2,028,294 		2,000 1,014.15 US$2,028,294
2025-04-21 2025-04-17 S Sale
2.5
Klauer James C

Executive Vice President

Officer
4,000 -8.3%
981.07
US$3,924,280 		4,000 -8.3% 981.07 US$3,924,280
2025-04-17 2025-04-17 PrS Proposed sale
2.5
Klauer James C

Officer

Officer
4,000
981.07
US$3,924,280 		4,000 981.07 US$3,924,280
2025-03-27 2025-03-27 PrS Proposed sale
2.9
MILLERCHIP GARY

Officer

Officer
1,100
940.01
US$1,034,007 		1,100 940.01 US$1,034,007
2025-03-27 2025-03-27 S Sale
2.9
MILLERCHIP GARY

Executive Vice President

Officer
1,100 -9.0%
940.01
US$1,034,007 		1,100 -9.0% 940.01 US$1,034,007
2025-03-25 2025-03-24 S Sale
2.6
Adamo Claudine

Executive Vice President

Officer
900 -11.4%
922.56
US$830,304 		900 -11.4% 922.56 US$830,304
2025-03-24 2025-03-24 PrS Proposed sale
2.6
Adamo Claudine

Officer

Officer
900
922.56
US$830,304 		900 922.56 US$830,304
2025-03-20 2025-03-18 S Sale
2.3
Frates Caton

Executive Vice President

Officer
850 -9.7%
900.25
US$765,213 		850 -9.7% 900.25 US$765,213
2025-03-18 2025-03-18 PrS Proposed sale
2.3
Frates Caton

Officer; Director

Executive Director
850
900.25
US$765,213 		850 900.25 US$765,213
2025-03-13 2025-03-11 S Sale
2.1
Vachris Roland Michael

President and CEO

Executive Director
3,600 -8.1%
931.00
US$3,351,600 		3,600 -8.1% 931.00 US$3,351,600
2025-03-11 2025-03-11 PrS Proposed sale
2.1
Vachris Roland Michael

Officer; Director

Executive Director
3,600
931.00
US$3,351,600 		3,600 931.00 US$3,351,600
2024-10-24 2024-10-24 PrS Proposed sale
2.4
GALANTI RICHARD A

Officer; Director

Executive Director
1,417
894.34
US$1,267,280 		1,417 894.34 US$1,267,280
2024-10-24 2024-10-24 S Sale
2.4
GALANTI RICHARD A

Executive Vice President

Executive Director
1,416 -4.9%
894.68
US$1,267,280 		1,416 -4.9% 894.68 US$1,267,280
2024-10-24 2024-10-23 S Sale
2.5
Jones Teresa A.

Executive Vice President

Officer
800 -21.3%
896.55
US$717,236 		800 -21.3% 896.55 US$717,236
2024-10-23 2024-10-23 PrS Proposed sale
2.5
Jones Teresa A.

Officer

Officer
800
896.55
US$717,236 		800 896.55 US$717,236
2024-10-15 2024-10-15 PrS Proposed sale
2.1
Riel Pierre

Officer

Officer
2,000
896.71
US$1,793,426 		2,000 896.71 US$1,793,426
2024-10-15 2024-10-15 S Sale
2.1
Riel Pierre

Executive Vice President

Officer
2,000 -16.4%
896.71
US$1,793,426 		2,000 -16.4% 896.71 US$1,793,426
2024-10-15 2024-10-11 S Sale
2.6
Miller Russell D

Sr. Executive Vice President

Officer
4,400 -30.1%
891.15
US$3,921,069 		4,400 -30.1% 891.15 US$3,921,069
2024-10-11 2024-10-11 PrS Proposed sale
2.6
THE MILLER FAMILY TRUST

Officer

Officer
4,400
891.15
US$3,921,069 		4,400 891.15 US$3,921,069
2024-10-02 2024-09-30 S Sale
2.6
Adamo Claudine

Executive Vice President

Officer
3,200 -27.1%
888.99
US$2,844,778 		3,200 -27.1% 888.99 US$2,844,778
2024-10-02 2024-09-30 S Sale
2.3
Frates Caton

Executive Vice President

Officer
1,700 -14.9%
883.35
US$1,501,695 		1,700 -14.9% 883.35 US$1,501,695
2024-10-02 2024-09-30 S Sale
2.8
Callans Patrick J

Executive Vice President

Officer
2,500 -3.6%
893.94
US$2,234,850 		2,500 -3.6% 893.94 US$2,234,850
2024-08-15 2024-08-15 PrS Proposed sale
2.6
DECKER SUSAN L

Director

Non-Executive Director
620
876.50
US$543,430 		620 876.50 US$543,430
2024-08-15 2024-08-15 PrS Proposed sale
2.4
GALANTI RICHARD A

Officer; Director

Executive Director
500
874.05
US$437,025 		500 874.05 US$437,025
2024-08-15 2024-08-15 S Sale
2.4
GALANTI RICHARD A

Executive Vice President

Executive Director
500 -2.1%
874.05
US$437,025 		500 -2.1% 874.05 US$437,025
2024-08-15 2024-08-15 S Sale
2.6
DECKER SUSAN L
Non-Executive Director
620 -5.0%
876.50
US$543,430 		620 -5.0% 876.50 US$543,430
2024-08-15 2024-08-13 S Sale
2.4
GALANTI RICHARD A

Executive Vice President

Executive Director
500 -2.1%
863.88
US$431,938 		500 -2.1% 863.88 US$431,938
2024-08-13 2024-08-13 PrS Proposed sale
2.4
GALANTI RICHARD A

Officer; Director

Executive Director
500
863.88
US$431,938 		500 863.88 US$431,938
2024-08-29 2024-07-25 S Sale
2.5
Jones Teresa A.

Executive Vice President

Officer
4 -0.1%
832.55
US$3,330 		4 -0.1% 832.55 US$3,330
2024-07-15 2024-07-15 PrS Proposed sale
2.9
DENMAN KENNETH D

Director

Non-Executive Director
350
851.53
US$298,036 		350 851.53 US$298,036
2024-07-15 2024-07-15 PrS Proposed sale
2.7
DANIEL M HINES AND JEAN SCHLINGER JT TEN

Officer

Officer
1,500
848.53
US$1,272,796 		1,500 848.53 US$1,272,796
2024-07-15 2024-07-15 S Sale
2.9
DENMAN KENNETH D
Non-Executive Director
350 -5.6%
851.53
US$298,036 		350 -5.6% 851.53 US$298,036
2024-07-15 2024-07-15 S Sale
2.7
Hines Daniel M.

Principal Acctg Officer
1,500 -12.0%
848.53
US$1,272,796 		1,500 -12.0% 848.53 US$1,272,796
2024-07-15 2024-07-12 S Sale
2.7
Hines Daniel M.

Principal Acctg Officer
1,500 -10.7%
844.20
US$1,266,300 		1,500 -10.7% 844.20 US$1,266,300
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